Ventilator



Sept. 27, 1932. c. A. PALMER VENTILATOR Filed June 14, 1929 2. Shaats-Shget l R a m n n I v gwueniot T; m m wlwk abl ozweq S p c A. PALMER 1,879,450

VENTILATOR Filed June 14, 1929 z'sheets-sheet 2 atentecl Sept. 27, 1932 UNITED STATES PATENT OFFICE? CLARENCE A. PALMER, F AKRON, OHIO, ASSIGNOR TO THE BURT MANUFACTURING COMPANY, OF AKRON, OHIO, A CORPORATION OF OHIO VENTIIATOB Application :llled .Tune 14,

This invention relates to ventilators, and more specifically to ventilators wherein a power driven fan is employed to increase the natural draft.

l-Ieretofore, power driven fans have been employed in ventilators, but these fans have been driven from a line shaft through sys. terns of belting or gearing. It is among the objects of my invention to provide a fan ventilator wherein the fan is driven by a motor directly connected to it, and placed within the ductleading to the ventilator. By the use of Ventilators of this sort the need for compli-- cated shafting and driving arrangements is avoided; installation is simplified, and the efliciency of the system may be increased.

A further object of my invention is the provision of a simple, strong and inexpensive support for a motor and fan within a ventilating duct.

A further object of my invention is the provision of a ventilator duct construction which will permit easy inspection of motor and fan.

A further object of my invention is the provision of duct construction which may support a motor without absorbing the vibration of the motor and fan and thereby insure quiet operation and TIGQdOIIlIIOIIl metallic noises in the ventilator.

Another object of my invention is to provide an efficient arrangement for cooling the motor by a current of air, while protecting the motor from dust, corrosive substances and gases which may be present in the air being exhausted through the ventilator.

My invention contemplates the provision of a ventilator which may be easily installed and which is suitable for a variety of uses.

The invention contemplates a ventilator which will operate efliciently either as a power ventilator or as a natural draft ventilator and which is therefore suitable for mill buildings, foundries and other buildings where it is necessary to exhaust large quantities during part of the day. but where the normal requirements are smaller; and which may be employed where dust, steam, or corrosive gases are present in the air flowing through the ventilator.

1929. Serial No. 370,797.

Further the invention contemplates the provision of a ventilator which will be useful in school buildings, auditoriums, and the like, where quiet operation is essential.

Further objects and advantages of my invention will be apparent from the following description of a preferred form thereof, ref-' erence being had to the accompanying drawings. The essential characteristics are summarized in the claims.

In the drawings, Fig. 1 represents an elevation partially broken away, showing my invention as applied to a ventilator; Fig. 2 is a horizontal section taken along the line 2-2 of Fig. 1; Fig. 3 is an enlarged vertical section on the line 33 of Fig. 2; Fig. 4 is an enlarged transverse section through the motor and supports, and Fig. 5 is a vertical section of the motor.

Referring now to Fig. 1 of the drawings, 1 indicates an air duct in which the motor 2 and fan 3, having blades 4, are mounted. This duct is preferably mounted in a vertical position and communicates with a preferred orm of ventilator indicated at 30. The ventilator may comprise a vertical air shaft 31 which is secured to the duct 1 by any suitable means such as rivets shown at 32. A downwardly and outwardly inclined deflector 33 is secured to the upper end of the air shaft 31, and the top of the air shaft is covered by means of a conical hood 34:, which has a diameter greater than that of the air shaft. The hood 34 is spaced from the end of the air shaft 21 by means of metal straps 35 in order to provide an air passage. Another downwardly inclined deflector 36 is carried by the straps 35 at a point between the top of the air shaft and the hood. Surrounding and spaced from the outer edges of the deflectors 33 and 36 and the hood 34. is a sleeve 37 which shields the ventilator from violent drafts of air currents and which assists in creating a draft thru it. The sleeve 37 may be supported in any suitable manner as by straps 38 and 39 which are secured to the hood 34 and the straps 35 respectively, and to the sleeve 37.

Within the ventilator I have provided a damper 40 in order to regulate the flow of air. The damper is preferably in the form of an inverted cone and is guided for vertical movement by the guides 41, which may be supported on the air shaft 31 by members 41a. The damper 40 is controlled by the chain. 42 which is connected to the damper thru straps 43. From the point of attachment to the straps 43, the cable 42 passes upwardly thru the pulley 44 which is secured at the apex of 'the conical hood 34, thence downwardly thru an aperture 45 in the conical damper 40. Then it is guided by pulleys 46 and 47 and the guideway 48 to a vertical position adjacent the walls of the air shaft 31 and the duct 1, and it may extend to any accessible point within the building in which the ventilator is installed. I have provided a fusible link 49 in the cable 42 so that in case of fire the cable will part and the damper will be automatically closed by gravity.

A door 5 is provided in the duct 1 to aflord a convenient means of access to the motor 2 and fan 3 for purposes of inspection, lubrication, etc. The propellor-type fan 3 is directly connected to the shaft 6 of the motor 2 which is supported within the duct by tubular supports 7. The supports 7 are threaded into the casing of the motor as will be more fully explained below and at their outer ends are provided with vibration absorbing and sound proofing devices, shown more clearly in Figs. 2 and 3. The vibration absorbing devices comprise pieces of fibre, leather, or other flexible material 8 provided with apertures thru which the supports 7 are inserted. The supports 7 are securely fastened to the flexible members 8 by means of nuts 9 and 10 which engage threaded end portions of the supports.

The flexible members are clamped to the outside of the duct 1 by metal clamping plates 11. Openings 12 are provided in the walls of the duct thru which the supports extend. The clamping plates 11 are arranged to engage the edges of the flexible members and hold them against vertical or circumferential movement, but if desired, the distance between the flanges 13 of plates and the wall of the duct 1 may be greater than the thickness of the flexible members, as shown in Fig. 3, so that space will be allowed for radial movement of the supports and all possibility of transmission of the vibration of the motor to the duct will be avoided.

In Figs. 4 and 5 I show in greater detail the construction of the motor and the cooling system which I prefer to employ. The motor 2 comprises a casing 15 to which are secured members 16 and 17 The armature 18 is carried by the shaft 6 which-is supported by bearings 19 and 20 mounted in suitable openings in the members 16 and 17. These openings are covered by disks 21 and 22, the disk 22 being provided with an opening through which the motor shaft may project.

The field 23 is supported by bolts 24 which extend through the members 16 and 17 and also secure these members to the casing. The field is provided with portions 25 which extend outwardly to the casing and which are notched as at 26 to receive the bolts 24. This method of mounting the field provides air spaces 27 between the casing and the field. Hollow threaded bosses 28 which communicate with the air spaces are provided in the casing 15, and I may screw the tubular supports 7 into these bosses.

Air from the outside of the ventilating duct may enter through one of the tubular supports and hollow bosses into one of the air spaces 27 and be exhausted from either of the other bosses. If for example, air enters through boss 28a into air space 27a, it may flow part way around the field in this air space, but because of the outwardly extending portions 25 of the field it cannot flow completely around the field and will be deflected into the air spaces 29 at the ends of the m0- tor where it acts to cool the armature, commutator, brushes, etc. From the end spaces it may flow into air space 27?) or 27 c and then out through the corresponding tubular support. I have found that considerable quantities of air are caused to flow through the motor due to air currents outside of the duct, differences in temperature and the rotation of the armature of the motor.

From the foregoing description it will be seen that I have provided an eflicient and simple ventilator which may be adapted to a great many uses. Because of its compact construction my ventilator may be installed in the same space as required by a natural draft I ventilator, yet, if desired, the motor may be remote from the ventilator and may be placed anywhere in the ventilating duct.

My ventilator is designed to create a strong natural draft and the conical damper which I have provided assists in directing the flow of air outwardly through the openings between the deflectors. Furthermore, because of their extremely simple construction the motor supports, motor and propeller-type fan offer very little resistance to the flow of air through the duct and when the power is turned off the ventilator will continue to function because of the natural draft. Thus, the motor need be operated only under severe conditions and a great saving of power is effected.

Because of the vibration absorbing devices provided in my motor supports, the vibration of the motor is not transmitted to the wall of the duct and objectionable metallic noises and rumbles are eliminated. Furthermore the danger of crystallization of the metallic duct at the points of attachment of the supports is removed. My tubular supports also make it possible to employ a motor which is completely sealed against any harmful substances which may be present in the air being exhausted, yet which may be efliciently cooled by air admitted to the motor from the outside of the duct.

I claim:

1. Apparatus for supporting a motor within a ventilating duct comprising in combination members extending radially from the motor and through the walls of the duct, fibrous vibration absorbing devices secured to said radially extending members, and means for securing said vibration absorbing devices to the outer walls of the duct.

2. The combination of a motor within a ventilator duct, said motor being totally enclosed in a casing, hollow members extending radially from the motor and through the. walls of the duct and through the motor casing, fibrous vibration absorbing devices secured to said radially extending members, and means for securing said vibration absorbing devices to the outer walls of the duct.

3. Apparatus for supporting a motor within a ventilating duct comprising in combination members extending radially and through the walls of the duct, flat pieces of fibrous ma* terial secured to said members, and clamping devices mounted on the duct for securing the fiat pieces against movement longitudinally or circumferentially of the duct, the flat pieces being spaced apart from the clamping devices to permit slight movement in a radial direction.

4. The combination of a motor within a ventilator duct, tubular members extending radially from the motor and through, but not touching, the walls of the duct, and flat washers of fibrous material secured at their centers to the extremities of said members and at their peripheries to the walls of the duct.

In testimony whereof, I hereunto afiix my signature.

CLARENCE A, PALMER. 

